草业学报2026，Vol.35Issue(1)：1-12,12.DOI:10.11686/cyxb2025087
三江源地区草地地上生物量时空变化及其对气候变化的响应
Spatio-temporal variation of grassland above-ground biomass and its response to climate change in the Three-River Source region
摘要
Abstract
The aim of this research was to better understand the spatio-temporal dynamics of grassland above-ground biomass(AGB)and its response to climate change in the Three-River Source region.We integrated ground-based observations from 15 ecological and meteorological stations in Qinghai Province with remotely sensed AGB estimates from 2003 to 2022.We then systematically analyzed the spatial distribution,interannual trends,and the response of AGB to variations in growing-season temperature and precipitation.It was found that:1)According to station observations,the multi-year average AGB ranged from 606.4 to 7545.8 kg·ha-1,with higher values at eastern and southern sites and lower values in the northwest.From 2003 to 2022,most stations exhibited an increasing trend in AGB,with the most significant increase observed at Nangqên station.2)The remotely sensed results revealed a distinct spatial pattern of AGB characterized by higher values in the southeast and lower values in the northwest.High-biomass areas were mainly concentrated in the eastern part of the study region,whereas low-biomass areas were distributed in the north and southwest,with the lowest levels in the western alpine steppe.Over the past two decades,the regional AGB showed a weak increasing trend,with no significant change in more than 80%of the area,and a significantly increasing trend in 6.84%of the area-mainly in the east and south.3)Partial correlation analysis showed that grassland AGB in the study area exhibited positive correlations with growing-season temperature and precipitation.Specifically,the correlation coefficient between AGB and growing-season precipitation(0.24)was higher than that between AGB and temperature(0.10),indicating that precipitation was the primary factor driving the increase in AGB in this region.Areas with significantly positive correlations between grassland AGB and temperature were mainly distributed in the eastern parts of the study area,whereas regions with significantly positive correlations between AGB and precipitation were concentrated in the western and northern areas.These findings provide a scientific basis and decision-making support for grassland conservation,resource management,and climate adaptation strategies in the Three-River Source region.关键词
草地地上生物量/气候变化/时空变化/三江源地区Key words
above-ground biomass of grassland/climate change/spatio-temporal variation/Three-River Source region引用本文复制引用
王喆,王镜,颉耀文,赵慧芳,校瑞香,宗萨才文求藏..三江源地区草地地上生物量时空变化及其对气候变化的响应[J].草业学报,2026,35(1):1-12,12.基金项目
青海省气象局面上项目(QXMS2024-43)和青海省科技计划项目(2023-ZJ-733)资助. （QXMS2024-43）
